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HOMESERVICE MANUALSCHEVROLET2013SILVERADO 2500 HD LT, 2D CAB CHASSIS, 6.6L ENG VIN 8, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSWIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - DRIVE MOTOR GENERATOR BATTERY CONTROL MODULE TO FUEL PUMP DISABLE MODULECOMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X2 (DIESEL)
2013 Chevrolet Silverado 2500 HD LT, 2D Cab Chassis, 6.6L Eng VIN 8, RWD

Engine Control Module (ECM) X2 (Diesel)

2013 Chevrolet Silverado 2500 HD LT, 2D Cab Chassis, 6.6L Eng VIN 8, RWDSECTION Engine Control Module (ECM) X2 (Diesel)
GM1968294Courtesy of GENERAL MOTORS COMPANY
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 12603596
  • Service Connector: 13574947
  • Description: 73-Way F MX123 34566 Series (BK)
Terminal Part Information
  • Pins: 1, 3-11, 13-19, 21-22, 25, 27, 29-32, 41, 47-48, 66-67
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe:J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins: 1, 3, 5-11, 22, 25, 27, 41, 47-48, 66-67 - K/K
  • Core/Insulation Crimp: Pins: 4, 13-19, 21, 29-32 - J/J
  • Pin 73
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
Engine Control Module (ECM) X2 (Diesel)

Pin Wire Circuit Function
1 0.5 L-GN 497 Fuel Pump Primary Relay Control (N2N)
2 - - Not Available
3 0.5 YE 2928 Fuel Metering Valve High Control
4 0.8 PU/WH 2530 Fuel Rail Pressure Solenoid Supply Voltage
5 0.5 BK 2929 Fuel Metering Valve Low Control
6 0.5 WH 5931 Variable Nozzle Turbo Solenoid Low Signal
7 0.5 TN 2752 Low Reference
8 0.5 TN 2753 Low Reference
9 0.5 BN 1174 Oil Level Switch Signal
10 0.5 BN 6782 Low Reference
11 0.5 TN 3653 Low Reference (LML)
12 - - Not Available
13 0.8 BN/WH 4901 Direct Fuel Injector (DFI) High Voltage Supply Cylinder 1
14 0.8 TN/WH 4907 Direct Fuel Injector (DFI) High Voltage Supply Cylinder 7
15 0.8 L-BU 4804 Direct Fuel Injector (DFI) High Voltage Control Cylinder 4
16 0.8 BN 4801 Direct Fuel Injector (DFI) High Voltage Control Cylinder 1
17 0.8 BK/WH 451 Ground
18 0.8 BK/WH 451 Ground
19 0.8 YE 2834 Low Reference
20 - - Not Available
21 0.8 BK/WH 451 Ground
22 0.5 D-BU 5930 Variable Nozzle Turbo Solenoid High Signal
23-24 - - Not Available
25 0.5 OG/BK 5929 Low Reference
26 - - Not Available
27 0.5 YE/BK 1827 Vehicle Speed Signal
28 - - Not Available
29 0.8 L-BU/WH 4904 Direct Fuel Injector (DFI) High Voltage Supply Cylinder 4
30 0.8 PU/WH 4906 Direct Fuel Injector (DFI) High Voltage Supply Cylinder 6
31 0.8 TN 4807 Direct Fuel Injector (DFI) High Voltage Control Cylinder 7
32 0.8 PU 4806 Direct Fuel Injector (DFI) High Voltage Control Cylinder 6
33-40 - - Not Available
41 0.5 BK 2755 Low Reference
42-46 - - Not Available
47 0.5 GY 2702 5 Volt Reference
48 0.5 GY 3652 5 Volt Reference (LML)
49-65 - - Not Available
66 0.5 TN 5928 Variable Nozzle Turbo Position Sensor Voltage Reference
67 0.5 PU/WH 6270 5 Volt Reference
68-72 - - Not Available
73 3 BK/WH 451 Ground
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.